[c10d] Remove test for init barrier (#103223)
Forward fix for intermittent failures after landing of #103033 (resolves issue #103195)
After #103033 , some tests are no longer applicable.
Cc @huydhn
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103223
Approved by: https://github.com/huydhn, https://github.com/wanchaol, https://github.com/fduwjj, https://github.com/ZainRizvi
